Electric-lamp socket.



PA'TBNTED JAN. 31', 1905;

M. NORD-EN ELECTRIC LAMP SOCKET.

' APPLICATION FILED MAB. 9, 1904. I

" suitable insulating material; 6, the base, also A central UNITEDSTATES Y Patented January 31, 1905. v

PATENT OFFICE.

MORTIMER NORDEN, OF

ELECTRIC-LAMP SOCKET.

SPECIFICATION. forming part of Letters Pat ent No. 781,351, datedJanuary 31 1905.

To a, whom, it 77mg concern:

wires without permanently injuring'the wiresv or their covering, such asshown in Letters Patentgranted to me April 22, 1902, No. 698,218; and myinvention is an improvement upon the socket shown and described in saidpatent. metal screw-sleeves shown in said patentmay be dispensed withand that the devices employed in said patent for holding the socket tothe cup other than the devices which form the electrical connectionwith'the conductors may also be omitted.

In my present invention I make use of a cup of insulating material, abase of insulating-material, and a metal socket within the cup. .Theadjacent and opposing faces of the cup and base are provided-withparallel recesses, forming channels for the conductors.

The device that holds these parts together also acts to clamp them tothe conductorsat anydesired point. In the lower portion of the cup thereare two perforations, through which pass pointed devices for makingelectrical contact with the conductor-wires. The head of one ofthese'pointed devices is in contact with a lug upon the metal socketwithin the cup, and there is a plate adapted for central contact withthe electric lamp, and the head of the other pointed device is in contacwith this plate.

In the drawings, Figure 1 is a vertical section representingmyimprovement. 'Fig. 2

isa plan of the same, and Fig. 3 is an invert-' ed plan of the cup.

at represents the cup of porcelain or other of suitable insulatingmaterial.

hole is made in the base for the stem of the I have found in practicethat the Application filed March 9, 1904. Serial No. 197,300.

bolt 0, and a central hole 2 is made in the cup a of varying sizes notonly for the stem of I receives the base of the incandescent electriclamp, the said metal socket making electrical contact with the peripheryof the lamp-base. This metal socket f is provided with a lug 5 at thebase at right angles to the surface of the socket. There is a hole inthis lug registering with one of t e perforations 6 in the lower portionof the cup. A screw 71, having a sharp point, is passed through the holein the lug 5 of the metal socket f and through the per foration 6 in thelower portion of the cup and is held in place by anut 8, which nut fitsinto a recess formed in the cup for that purpose. The head of this screw1; rests upon the lug 5 of the metal socket f when the said screw isscrewed down into contact withthe conductor d, and thus serves to holdthe metal socket f to the cup, as well as to make metallic contactbetween the metal socket and the conductor cl.

I employ a metal plate h, which rests ina depression of the innersurface of the cup and free from electrical connection with the'metalsocketf, but forming a central contact with the electric lamp, and thisplate it is perforated for the passage of the screw'dformedlike thescrew c. The screw 2' is passed through the perforation 7 in the lowerportion of the cup and is held in place by a nut 9,"which nut is fittedintoarecess formed in the cup similar to that provided for the nut 8.The screws 6 z" are rotated until their points pass through thecoverings of the conductors c and make contact metal to metal with thewires of the conductors, thus carrying the electric current to the lamp.The apertures made in the cov-' erings of the conductors by the pointsof the screws are so small that the conductors are not injured and areadapted for repeated use. I

I claim as my invention 1. The combination with a cup havingperforations in the bottom and a base of insulating material, and meansfor receiving electric conductors between the said parts, and a clampingdevice for holding the conductors thereto, of a metal socket within thecup of insulating material, a central metal plate, pointed devicespassing entirely through said perforations and through perforations inthe socket and plate, and adapted to penetrate the covering of theconductors, and means adjacent to the outer surface of the cup forholding the pointed devices in a fixed position, sub stantially as setforth.

2. The combination with a cup having perforations in the bottom, a baseof insulating material, and coinciding recesses receiving electricconductors between said parts, and a clamping device for holding theconductors thereto, of a metal socket within the cup of insulatingmaterial, a central metal plate, screws passing entirely through saidperforations and through perforations in the socket and plate with theheads of the screws coming above the parts of the socket and plateengaged thereby and the pointed ends adapted to penetrate the coveringof the conductors and nuts engaging the threaded ends of said screws andlocated within the recesses of the cup for holding the screws in a fixedposition, substantially as specified.

Signed by me this 7th day of March, 1904-.

BIORTIMER NORDEY:

\Vitncsscs:

Geo. T. PINekNnY, BERTIIA M.,ALLEN.

